Mr Iantosca said: “GoGen is one of several telephone fundraising agencies in the UK and our pricing is in line with our competitors.

"We are one of the most effective agencies in the sector.

“GoGen only make calls to people whose details have been selected by our clients from either their own supporter databases or third party data suppliers.

“All scripts and fundraising strategies are agreed in advance by our clients.

"We work together with our clients as well as industry monitors to ensure all calls GoGen make are made to an exacting standard, conform to industry best practice and are made with ­sensitivity and consideration.”

He said GoGen operates a “rigorous and ongoing process of vetting, training and monitoring” of all call centre staff to maintain high standards of calling.

“Our clients recognise that telephone fundraising is one of the most important fundraising tools available to them and that we successfully deliver them a cost-effective service.”

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Charities are paying up to 60% of donations to a telesales firm. Is this excessive?